Y plus, fine mesh in wall, error

fazadzulhimam · December 30, 2013, 07:19

hello everyone, i have a problem about y plus in turbulent flow,
i'm trying to resolve turbulent flow with "STANDARD WALL FUNCTIONS",
later, the results will be validated with experimental results

the rules for y plus with "STANDARD WALL FUNCTIONS" must be 30 < Y plus < 60, but when i get y plus with range 30 - 60 i have big error after validated,

if range of y plus fulfilled, what the results are definitely correct?
i used standard k-epsilon model

thanks for the help

hrvig · December 30, 2013, 07:29

How many cells do you place within the boundary layer?
Do you know the thickness of your boundary layer?
Guidelines suggest that 8-10 cells should be placed within the boundary layer typically yPlus from 20 to 200.

I suggest you have a look at Best Practice Guidelines by ERCOFTAC.

fazadzulhimam · December 30, 2013, 08:07

thank you hrvig and thanks for your suggest
is that guidelines for FLUENT ?

i didn't see cells in the boundary layer,
in near wall, i added mesh with "inflation" with maximum layer => 5

December 30, 2013, 07:19	Y plus, fine mesh in wall, error	#1
fazadzulhimam New Member faza dzulhimam Join Date: Sep 2013 Location: indonesia Posts: 8 Rep Power: 12	hello everyone, i have a problem about y plus in turbulent flow, i'm trying to resolve turbulent flow with "STANDARD WALL FUNCTIONS", later, the results will be validated with experimental results the rules for y plus with "STANDARD WALL FUNCTIONS" must be 30 < Y plus < 60, but when i get y plus with range 30 - 60 i have big error after validated, if range of y plus fulfilled, what the results are definitely correct? i used standard k-epsilon model thanks for the help

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December 30, 2013, 07:29		#2
hrvig New Member Jakob Hærvig Join Date: Sep 2012 Location: Aalborg, Denmark Posts: 27 Rep Power: 13	How many cells do you place within the boundary layer? Do you know the thickness of your boundary layer? Guidelines suggest that 8-10 cells should be placed within the boundary layer typically yPlus from 20 to 200. I suggest you have a look at Best Practice Guidelines by ERCOFTAC.

December 30, 2013, 08:07		#3
fazadzulhimam New Member faza dzulhimam Join Date: Sep 2013 Location: indonesia Posts: 8 Rep Power: 12	thank you hrvig and thanks for your suggest is that guidelines for FLUENT ? i didn't see cells in the boundary layer, in near wall, i added mesh with "inflation" with maximum layer => 5